eBay is a global phenomenon because it has become one of the most popular and widely used online marketplaces in the world. It allows people to buy and sell a wide range of products, including electronics, books, clothing, jewelry, and more. eBay's success can be attributed to its user-friendly interface, easy-to-navigate search engine, and secure payment system. Additionally, eBay has established partnerships with major retailers and manufacturers, providing buyers with access to a vast selection of products at competitive prices. Overall, eBay's influence on the global e-commerce industry cannot be ignored.